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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | $ 0 | $ 0
Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | (4) | 0
Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 0 | 0
Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | $ (34) | $ (38)

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